"I'd have to say getting a boyfriend or girlfriend's name tattooed on them is the most common tattoo regret," Kat tells RealSelf. "Relationships don't always last as long as the tattoos." But if you're going to get inked and want to avoid that Oh-Jesus-what-did-I-just-do feeling afterward, says Kat, do your homework: "Research is the one thing that is neglected the most."

If you want to keep certain tats hidden from, say, potential employers, vigilant grandparents, or officers of the law, you can always use Kat's new Tattoo Concealer. But, says Kat, if you're "really determined" to get that ink erased for good, do it right: " I would recommend doing your research on the most experienced dermatologist in your area that does tattoo removal."